[1] In the original planning of Crisis on Infinite Earths, the History would have formed the final two issues, following the destruction of the Multiverse at the beginning of time, but this was changed.

[2] The loose plotline of the series involves the character Harbinger chronicling the past, present, and future of the post-Crisis DC Universe.

The Next Men characters made a prototypical appearance as "Freaks" in a lithography plate that was published within the History of the DC Universe Portfolio in 1986.

The other plates in the portfolio included art by Stephen R. Bissette, Brian Bolland, José Luis García-López, Keith Giffen, Dick Giordano, Joe Kubert, Steve Lightle, Jerry Ordway, George Pérez, Curt Swan, and John Totleben.

[9] After the events of Infinite Crisis, DC included a backup feature titled "History of the DCU" in 52, running in issues #2–11 and written by Dan Jurgens.